Abstract
A model is proposed that describes the porosity, hardness, and fracture toughness of ceramic composites with agglomerates of graphene platelets. The model assumes that the agglomeration of graphene platelets occurs during the hot pressing of such composites, and pores are formed around the agglomerates. Within the model, the dependences of porosity, hardness, and fracture toughness of ceramic/graphene composites on the volume fraction of graphene are calculated. It is shown that the formation of pores explains the experimentally observed drop in the hardness and fracture toughness of composites for the volume fraction of graphene exceeding a critical value. The results of the model agree with the experimental data for the composites Al2O3-WC-TiC-Gr.
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